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L. C. LARSEN. MOLD FOR REPAlRING CONCRETE CYLINDERS.

APPLICATION FILED SEPT-22,1919. I 1,324,422. Patented Dec. 9,1919.

. 2 SHEETSSHEET l- [In/en for 10/: C. la/sea L. C. LARSEN.

MOLD FOR REPAIRING CONCRETE CYLINDERS APPLICATION FILED SEPTLZZ, 1919.

l 324,422. Patented Dec. 9, 1919.

2 SHEETS-SHEET 2- fm/enfor [4/5 610/3? with the sand gas et removed toshow the LABS C. LAB-SEN, 01 SAN FRANCISCO, CALIFORNIA.

MOLD FOR REPAIRING CONCRETE CYLINDERS.

Specification of Letters Patent.

.Patented Dec. 9, 1919.

Application filed September 22, 1919. Serial No. 325,819.

To all whom it may concern:

Be it known that I, LABS C. LARsEN, a citizen of the United States,residing in the city and county of San Francisco and State ofCalifornia, have invented a certain new and useful Improvement in Moldsfor Re-' pairing Concrete C linders, of which the following is a specication.

My invention relates to improvements in molds for repairing andresurfacing concrete cylinders and the like, wherein a sand gasketoperates in conjunction with hinged segments forming an annular casingfor retaining a grouting mixture around a cylinder to repaired.

One object of my invention is to provide an improved form for inclosingconcrete cylinders and the like for repair "and surfacing.

A second object of my invention is to rovide means for greatlyfacilitating the placement and removal of such form especially adaptedfor usein repairing concrete cylinders wholly or partially submergedunder water.

A third object'of my invention is to provide improved means forretaining the wet concrete mixture within such form pending thehardening of said mixture in the repair and surfacing of concretecylinders of large diameter wherein a sand gasket prevents the escape ofthe concrete mixture from a break to be repaired.

I accomplish these and such other objectsas may hereinafter be set forthby means of the device disclosed in the rawings forming a part of thepresent specification wherein like characters of reference are used todesignate similar parts throughout said specification and drawings. (andin which Figure 1 is a side elevation of a portlon of my improved formasapplied to a concrete cylinder;

Fig. 2 is a broken vertical mid-section view taken at right angles tothe view shown in Fig. 1 disclosing the method "of closing a break;

Fig. 3 is a cross section view theline 3-3 of'Fig. 1 in the dicated; 0

Fig. 4 is a view similar Fig. 3 taken alon the line 4 -4: of Fig. 1

taken along direction into that shown in construction of the supportingcup.

The invention is designed for use in the coming this difiiculty mold 1is formed repairing of concrete cylinders of the type used as supportsfor piers and wharfs and the like. Such supporting pillars are commonlymade of concrete reinforced with vertical rods orbars and a wirewrapping encircling said bars. Portions of the concrete are often brokenaway by contact with the hulls of ships or other floating objects, andworn by the erosive action of the water until frequently large portionsof the reinforcement bars and Wire are exposed to the corrosive actionof the water. Such breaks greatly weaken the pillar and if allowed tostand without repair. greatly increase the effect of both the used forthe surfacing of wooden piles are,

not eflicient in the repair of pillars of this type as in lowering suchmolds the broken sections are often of such area as to permit of theescape of the grout as in a by-pass around the retaining means used. Myinvention affords an eflicient means for overas used in conjunction withthe improved type of mold hereinafter described.

Referring to the drawings the device is' seen to comprise a plurality ofcylindrical mold forms 1 open at the ends thereof and superimposed invertical relation. Each by two semi-cylindrical sections comprisingsegments 2 .secured in hinged relation by suitable hinges 3.v Thesemi-cylindrical sections are secured in assembled position around aconcrete cylinder 4 by pins 6 engaging holes .7 in the meshing. ends ofangle iron flanges 8 secured by suitable bolts to ribs constitutinghoops 9 at either end of the cylindrical mold form when assembled asshown in Fig. 1 of the drawings.

Hooks 11 pivotally secured to the lower rib of each section engagestaples 12 suitably positioned upon the upper rib of the ably secured tothe lowermost casing and provided with .holes 16 in the ends thereof forrpceiving a hook 17 constituting a part of the supporting tackle,afl'ord means supportin the assembled forms when in. use.

The lowermost form is provided at the 7 bottom thereof with an inwardlyprojecting flange 18 constituting a part of the lower,

corrosive and erosive ac-.

hoop 9 which serves to support a sand gasket retaining cup formed by aplurality of metal plates 19 upwardly bent at the inwardly projectingends thereof into a cup with a substantially closed bowl on the innersurface thereof, said plates being separated by a narrow space graduallyincreasing in width toward the outer diameter. The cup formed by theplates 19 serve as a semi-rigid support capable of sustaining the weightof the sand gasket and the concrete mixture and at the same time allowsullicient expansion to permit the form to be lowered over the concretecylinder by conforming to slight variations in the diameter of saidcylinder. ()n the upper surface of plates 1%) strips of heavy canvas orother suitable ma terial 21 are secured by suitable rivets 22 forclosing the spaces intervening between said plates 19, and overlappingat the junetion point of thcsectors thereby providing a tightly closedbottom in the form. The plates 19 are. made 0t such a length as to forma close contact with the surface. of the cylinder to be repaired tor adistance sullicient to completely cover any break in said cylinder asshown in Fig. '2 of the drawings, thereby preventing the wet concretegrout from entering the break and escaping through the lower portionthereof as through a by-pass before. said lower portion is closed by thesand gasket retaining cup.

Ropes 2i are secured on the lowermost hoop 9 as a means for pulling thesemi cylindrical sections apart. at the bottom and supporting saidsections in removing the form "from the cylinder 4 after the groutingmaterial has hardened.

The pins (3 are attached by links engaging eyes 2G in the ends thereofto a chain 27 extending above the surface of the water for disengagingthe senii-cylindrical sections constituting the assembled form.

Slip bolts engaging holes: 29 in the upper and lower hoops 9 in adjacentsections enable the Form to be separated for the entire length thereofwhen the uppermost section has been looscnetht'rom the hardened concretegrouting mixture.

The ribs constituting the hoops 9 com 'irise a plurality of sections,the lowermost section of the lower rib projecting beyond the end of thecasing and forming an annular rim ll o'l' slightly greater diameter thansaid casing for engaging the edge of the next lower form therebyfacilitating the alineinc-n1 and retention of the forms in superimposedrelation.

ln operation the device is as follows:

The sections co ituting the mold are asecmbled sncccssircl around thecylinder to toe repaired or surfaced by matching the angle iron flanges8 as shown in Fig. l of the drawings and are held in cngagen'ient by thepins 8 inserted in holes '7 provided in the.

meshing ends thereof and positioned in such manner as to register whenthe sections are brought to a close lit.

The annular channel closed at the bottom by the sup )orting cup whenassembled is filled with sand to a point slightly above the uppermostportion of the. cup, thereby forming a gasket upoirwhich the concretemixture is retained thereby preventing said mixture from descemling intothe cup and hardening therein rendering removal. extremely dillicult.

Forms are successively assembled, filled and lowered until the cylinderis incase to the desired point, where it is supported until the concretemixture which has been carried down and caused to fill allirregularities in the surface of said cylinder has hardened to an extentsufficient to support the weight of the -asing and concrete. The tackleis then removed and the form allowed to remain in place until such timeas the concrete mixture, has completely set.

When it is desired to remove the form, the pins 3 are withdrawn by meansof the chains: '27. The uppermost form is loosened from the concrete bya slight tapping with a suitable mallet whereupon thesemi-cylindricalsections being bound by the slip bolts 28 may be priedapart. for the entire length. Ropes ll are provided for pulling apartthe lower ends of the sections, thereby emptying the sand gasket whereonthe sections rise to the surface due to the buoyancy of their woodenconstruction and being held together by the books 11 are readilyrecovered as one piece. from the cylinder by virtue of its own weightwhen the pins 6 are withdrawn, in which event the tail ropes are used toprevent the; sinking of the forms due to the weight of the sand gasket.

in my present practise l find that a more substantial retaining cltectis obtainable with a aand gasket retaining form comprising twosemi-cyllndrical sections comprising the mold. the hinged eltect of theuppermcmbers being suliicient for securing an easy separation from theform. However I do not restrict myself either to the hinged or nnhingedform for the lowermost member retaining the sand gasket.

The supporting cup plates ll) serve to equalize me distance between theform and the cylinder at the bottom. Any convenient. wedge may be u edat the top to maintain an equal distance between the form and thecylinder, my present practice being the use of tour common woodenblocks, not shown, in accomplishing this purposef The retaining cup andsand gasket is a novel feature essential to the successful operation ofmy invention in that means must he provided for preventing the e cape ofthe great as previously described and at Occasionally the form breaksfree,

cylindrical sections;

the same time provide means for recovering the lowermost form retainingsaid sand gasket after the hardening of said grout.

The novel method of securing the semicylindrical sections and the readymeans for disengaging the several retaining pins 6 by the chains 27extending above the surface of the water greatly facilitates the removalof the forms from the cylinder.

The hinging of the segments in forming the semi-cylindrical sections isof material advantage in securing an easy separation of the form fromthe hardened concrete mixture used in repairing and resurfacing ofconcrete cylinders and the like.

Having thus clearly and fully described my invention, what I claim asnew and desire to secure by Letters Patent is:

1. A mold for repairing concrete cylinders and the like comprisingmatched semicylindrical sections; means for securing said sect-ions intoa cylindrical form around a concrete cylinder; means for retaining asand gasket in the lower portion of said form.

2. A mold for repairing concrete cylinders and the like comprisingsegments hingedto form semi-cylindrical sections; means for securingsaid sections into a cylindrical form around a concrete cylinder; meansfor securing a plurality of such forms in alinement in superimposedrelation; and means for retaining a sand gasket in the lowermost form.

3. A mold for repairing concrete cylinders and the like comprisingsegments hinged to form semi-cylindrical sections; means for detachablysecuring said sections into semi-' cylindrical forms around concretecylinder; means for detachably securing a plurality of such sections insuperimposed relation; and means for retaining a sand gasket in thelowermost form.

4. A mold for repairing concrete cylinders and the like comprisinghinged segments forming semi-cylindrical sections; pins engaging holesprovided in meshing flanges secured thereon for detachably securing saidsections into cylindrical forms around a concrete cylinder; means fordetachably securing a plurality of such forms in alinement insuperimposed relation; means for. retaining a sand gasket in thelowermost form of such superimposed members.

5. A mold for repairing concrete cylinders andthe like comprising hingedsemi; pins engaging holes provided in meshing flanges secured on theouter surface thereof for detachably securing said sections intocylindrical forms around a. concrete cylinder; an annular shoulderforming a part of a binding hoop at the lower extremity of said formsfor securing alinement; hooks and stapl poaround a concrete tioned onadjacent sitioned on adjacent binding hoops for detachably securing saidforms in alinement in superimposed relation; and means for retaining asand gasket in the lowermost form of said superimposed members.

6. A mold for repairing concrete cylinders and the like comprising.hinged semicylindrical sections; pins engaging holes provided in meshingflanges secured on the outer surface thereof for detachably securingsaid sections into cylindrical forms around a concrete cylinder; anannular shoulder forming a part of a binding hoop at the lower extremityof said forms for securing alignment; hooks and staples positioned onadjacent binding hoops for detachably securing saidforms in alinement insuperimposed relation; means for detachably securing a plurality of suchforms in alinement in superimposed relation; and means for retaining asand gasket in the lowermost form of s'aid superimposed members; andslip bolts engaging holes provlded in said adjacent binding hoopssecuring superimposed members against a transverse displacement inloosening said members from the cylinder.

7. A mold for repairing concrete cylinders and the like comprisinghinged semi-cylindrical sections; pins engaging holes pro- "ided inmeshing flanges secured on the outer surface thereof for detachablysecuring said sections into cylindrical forms cylinder; an annularshoulder forming a part of a binding hoop at the lower extremit of saidforms for securing alinement; hooks and staples positioned on adjacentbinding hoops for detachably securing said forms in alinement insuperimposed relation; means for retaining a sand gasket in thelowermost form of said superimposed members; slip bolts engaging holesprovided in said adjacent binding hoops securing superimposed membersagainst a transverse displacement in loosening said members from thecylinder;means for detachably securing a plurality of such forms inalinement in superimposed relation; and overlapping canvas stripsriveted to metal plates secured in the lowermost form of saidsuperimposed members, for retaining a sand gasket in close semi-rigidconformance to the surface of a concrete cylinder.

8. A mold for repairing concrete cylinders and the like comprisinghinged semicylindrical sections; pins engaging holes provided in meshingflanges secured on the outer surface thereof for detachably securingsaid sections into cylindrical forms around a concrete cylinder; and anannular shoulder forminga part of a binding hoop at the lower extremityof said forms for securing alinement; hooks and staples pos bindinghoops for detachably securing said forms in alinement in superimposedrelation; means for retaining a sand gasket in the lowermost form ofsaid superimposed membersgslip bolts eugaging holes provided in saidadjacent binding hoops securing superimposed members against atransverse displacement in loosening said members from the cylinder;means for detachably securing a plurality of such forms in alinement insuperimposed relation; and overlapping canvas strips riveted to inwardlyprojecting metal plates up- Wardly bent to form a cup for retaining asand gasket in close semi-rigid contact with the surfaceoi"; concretecylinder of sufiicient depth to close a break to be repaired in saidcylinder.

9. A mold for repairing concrete cylinders and the like. comprising asand asket retaining form; hinged semi-cylindrical sections secureddetachably in superimposed relation to said sand gasket retaining form;pins engaging holes provided in meshing flanges secured on the outersurface of each section. for securing said sections into cylindricalforms around a concrete cylinder to be repaired; an annular shoulderforming a oi a binding hoop at the lower extremity of said forms forsecuring alinement; hooks and staples positioned on adjacent bindinghoops for detachably securing said forms in superimposed alineinent; andmeans for disengaging the sections from the surface.

10. A mold for repairing concrete cylinders and the like comprising asand gasket retaining form 3' hinged semi-cylindrical sections secured,detachably in superimposed relation to said sand gasket retaining form;pins engaging holes provided in meshing flanges secured on the outersurface of each section for securing said sections into cylindricalforms around a concrete cylinder to be repaired; an annular shoulderforming a part of a binding 1100 at the lower errtremity of said formstor securing alinement; hooks and staples positioned on adjacent bindinghoops for detachably securing said forms in superimposed alinement;means for disengaging the sections from the surface; and a chain securedto said pins for removing said pins from above the Water in witnesswhereof I hereunto set my signature.

LABS G. LARSEN,

